Shears



Jan. 24, 1928. l 656 923 J. J. SEME SHEARS Filed March 25. 1926 rraR/vfy.Patented dan. 24, 1928.

il iT F. D STA earner orifice. A

Jorrit a. or Ladntvoon onro enanas.

Application llled March 25, Serialml'o. 97,153.

. maybe operated from a standing posture.

L) .is

The Ainvention. may be embodied in various 'forms of, which two formsarev illustrated in the accompanyingl drawings for the purpose ot'clearly exemplifying the principles in-` volved, and consists of thestructure and.

and

combinations hereinafter` described claimed.

in the accompanying drawings:

Figure l is a side elevation of the comA plete shears.` constructed inaccordance with my invention;

Fig. 2 is an enlarged vertical longitudinal axial section of the lowerpart or' the shears shown in Fig. l;

Fig. Llis a plan View of the lower port-ion of the shear mechanism;

Fig. l is a plan section `on line IV-IV of Fig. 2, showing the camemployed to operate the shear blades; o y y n Fig.` 5 is a verticalcrosssection on line lL-V of Fig. '3;

Fig. G is a view showing the inside ot the cam, taken on line VI-VI ofFig. 2;

Fig. 7 is a p'lan vienY of the shears similar to Fig. 3 but showing amodified form of construction in which the handle is placed at rightmigles iviththe shear blades;

Fig. 8 is a fragmentary View, similar 'to Fig; 2, taken on line VHI-VIHOFiga/, showing/the modiiied 'form et construction.

Referring to the drawings in detail, in which the saine reference numberis`used throughout to designate the saine part, a base plate l isprovided with posts 2, connected by cross-bar or bearing-bar The posts 2consist Vpreferably oi sleeves interposed bei tween the base plate l andthe bearing-bar 3, the bearing-bar beingl secured to the posts by meansot screws l passing through the base plate and thesleeve and threadedinto the bearing-bar.

Shear-blades 5 are mounted on the base plate and pivotally connectedthereto and to each other by means of a screvvbolt 6 passing,` throughthe base plate and the blades, secured by a nutl i'. The blades areprovided with rearwardly entending arms 8, each pro vided at. its rearend with an upwardly pro jectingpin 9.1 Means hereinafter described are`provided for positively closing the blades;

ll surrounding Athe pivot o', neld in place'by a ,plate-l2 Yeng-agingthe upper sidey of the coil and havingx Va flange or lug' 13 be'ntf'intoengagement `With the coil. From the'co'il eX tend rearwardlytivofarmsfle Which restl againstthe pins 9. 'lhespringisso vtensioned asto hold the blades normally lin an open position.

In `the term of 'the device shown in Figs. l to 6, the handle member,bywhicli the shear-blades are operated7 is placed atan angle to thebase. For this purpose the bearf ingbar 3 is'provided ivith anenlargement le, preferably set at an angle to the base, such,enlargement being provided with a threaded aperture l6,`in Whichiisthreaded the lower endo'f a tubular handle 17; This handle is ora lengthsuch as to enable a `user of the device to operate the sheanblades Whilein a standing posture. This tubular member maybe ot any deslredcross-section`7 but it is preferably circular,1 and is provided at theupper end With a gripping part 1S to enable lthesaine ,to beeffectively'heldwby the operator. `This gripping part may be or'. any`contour, butas shown in the drawings,A

is `square in cross-section.

.The closing motionof the shear-blades is given by a camV plate 19ywhich consists of' a p'late jot general rectangular 'formation hav`ing; an edge Harige 20. This'ilangre is formed into two internal cams2l-22, which, upon rotation thereof1 engage the pins 9,'thus causing`the shear-.blad &2 to be closed. A. de-

i tail of the cam is illustratedin Fig'. 6. The

cam surface/of cam 2l extends from the point ato the high point o, andcam surface Q'Zextcnds 'from the point o to high point d. rihc curvedparts oft the flange 2O from the point to o and from pointid to a do notfunction as cam surfaces, but are formed as shown for a reasonhivhichwill hereinafter y h to cause them to automatically operi; thereisprovided spring,n l0 having a coilr4 tends upwardly through the tubularhandle 1T and to the upper end of which is con neeted an operating,Thandle 25.

In the torni of the device shown in Figs. l to (l, the handle isarranged at an obtuse angle to the hase plate and consequent-ly the earnplate rotates in a plane at an acute angle with the plane ot the haseplate. Upon reflection it will he seen that the Cain surfaces, uponrotation of the Cain, tend to change their relation, in a `verticalplane, to the pins 9. ln order to accommodate this Change of relation,'and still maintain a. cam surface of minimum Width, l provide meanswherein7 the cani plate may have limited motion hetween the hase plateand the hearinghar. 'lhie` means consists in making the operating rod 24of sut-l1 length that it ma),7 shift up and down, to a limited extent.lt ia desir allie, although not necessary, to :nitomatiCall)r take upthis lost motion; tor this purpose l interpose a coil spring;- 2lihetween the earn plate and the hearingba1z pm'mf'if'oa-mlo operate theshears. the operator grasps the gripping handle t8 with the left handand the operating handle with the right hand and rotates the cam platell), such rotation Causing; 'the pins S) on the shear-blades to heengaged simultaneously h v the cani-surfaces its soon as the pins .lpass the high points` (l. ol the ram plate, the spring 10 causes thepinsA to snap hy the high pointe` and eoine to reet at. the ends; ot theearn plate. The curved portions ot the earn plate 'l'roni the points toe and (Z to L are provided in order to permit the pins to pass quicklyfrom the high points ol the cani to the ends ot the plate.

Figs. T and 8 showv av slightly modified torni in which the handle isplaced at ri glit, angles to the hase plate. llhen the handle is soplaced. it is unnecessary to provide means whereby the Cain plate ma;Tmore np and donn, relatively to the hase plate, and therefore the eoilspring 2G shown in Fig. Q, may he dispensed with.

Sueh lost motion would not he ahsolutely essential, eren in the formdiselosed in Figs. l to t3, as it is obvious that it the Cain surlaeewere oit sullieient Width and the pins were made of sul'lieient length,the earn eouhl he rotated in a lined plane and still operate theshear-blades etleetively. l-lon'ever, in this ease. the arrangementwould not he as eompaet as that shown in the preferred rorin.

lVhile I have shown two forms ot the device, it is to he understood thatthey merely a liaze, shear hlrn'lee pirotallj.' inounttal thereon andharing arms tvitninlfnn reafo'tsrtlly troni the pivot. upwardlyproieetinjg pin-i at the rear wide ot Said arme. a` tahnlar gripping1handle liied to f-ahl has@ and extend i1 kkr al an anale tl'nerelrom. atotalahle operatinj, handle and a shalt eonnwtetl there Vwith, thelaller extending through the gripping hainllc: a rain al the loiwr einlol the wperatinn handle haring rain :anl'aces eo ogm'atinnl with thenies in the arms oli the shear hladea to einen auna when said shaltrotated in one direction, and means adaptetl to opi-n the hlachs whenthe shalt is rotatie! in the opposite direetion.

ln a derive ol' the rlniirat'ter tleaerihed, a hase. hear-lilaller;pivolallli,V mounted thereon ami having arms o 'tteinlingg rearwartllyl'ioin the pivot, npvfartllr 'iunior-.ting 'pine at` the rear ont-ls ol'Said arme. a tulailar `gripping handle lifted to said hare andextenfliuj.; ai an angle therefrom, a rolatahh operating handle limriiipa shall` extending; through the grripl'iing-1' handle, a Cam plate onthe loner end ot the opnraii'ig hainlle ha ring; cani snrv tareaanimating with the pins in tlnl arms o'l the .slwar-hlatles to elose theeamo, and means to imtoniatieally open the hlatles.

2l. rl`he eonstrini'tion epeeiliml in claim l in whieh the gripping;handle ie' arrangtal at an angle elituee to the plane ol" the han...

l. 'l`he c :oinitinetion eprritieil in elaim il in which the grippinghandle is arranged at angle olllinfe to the plane nl the hase, and theopnrating handle haa a limited lon- `itinlinal motion through thekgrii'lping handle.

u. The .consetirinrtitni speeil'ied in claim L in which the trippinghandle is arranpfwl at an angle olituse to the plane ol' the hause. theoperatinel handle has a limited ,lonifritlnlinal motion through the`zgripijiinnj handle, and resilient means is interposltal heln'een therain plate on the lower enrl olf the operalirnr; handle and a lixetlpart ol the hase.

Signed hy.' me this` llrd ilaj.' ol 'l'arcln will. i

,lllN rl'. SERIE,

llll) lll.)

